JP2006087300A - Vibrator of oscillation generation motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrator which is hard to be separated from a rotary stem and superior in durability, even if a motor is small in size. <P>SOLUTION: The vibrator 4 of a block shape which is secured in an off-centered manner to the rotary stem 3 of an oscillation generation motor includes a stem fixed side 5 for fixing the rotary stem 3, and an a stem insertion groove 6 which is formed at the stem fixed side 5 and in which the rotary stem is inserted. The stem fixed side 5 has a part compressed by a pressed piece 11 which descends perpendicularly to the stem fixed side 5 near the stem insertion groove 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vibrator for a vibration generating motor used for a calling function of, for example, a mobile communication device.

Conventionally, as disclosed in Patent Document 1 and Patent Document 2, the rotating shaft is inserted into the vibrator and the rotating shaft is caulked and fixed by a mounting member of the vibrator, and the rotating shaft is press-fitted into the vibrator as in Patent Document 3. There are known a method of fixing by rotating or inserting a rotating shaft into a vibrator as in Patent Document 4, and fixing by welding.
Japanese Utility Model Publication 4-13860 Japanese Patent No. 2518781 Japanese Utility Model Publication No. 6-48369 JP-A-6-98496

  By the way, the conventional fixing method has an advantage that the vibrator can be reliably fixed to the rotating shaft in a short time, but the vibrator needs an attachment member for fixing to the rotating shaft. However, when the motor is reduced in size and the thickness of the mounting member is reduced, problems such as breakage of the mounting member due to the occurrence of cracks and instability of the vibrator fixing due to insufficient force for caulking the rotating shaft occur.

  An object of the present invention is to solve such a problem, and to provide a vibrator having excellent durability that does not easily come off the rotating shaft even if the motor is downsized.

  The vibrator according to claim 1 is a vibrator eccentrically fixed to the rotation shaft of the vibration generating motor, and is formed on the shaft fixing surface for fixing the rotation shaft, the shaft fixing surface, and the rotation shaft is inserted. The shaft fixing groove has a flat surface in the vicinity of the shaft insertion groove that is compressed by a press piece that descends in a direction perpendicular to the shaft fixing surface.

  When such a configuration is adopted, when a compression scheduled plane in the vicinity of the shaft insertion groove of the shaft fixing surface is compressed with a press piece, the press piece embeds the shaft fixing surface in a concave shape to form a press concave portion. As a result, the inner wall surface of the shaft insertion groove adjacent to the press recess protrudes inward. This overhang narrows the width of the shaft insertion groove. Therefore, for example, if the press recess is compression-molded in a state where the rotation shaft is inserted into the shaft insertion groove, the rotation shaft inserted into the shaft insertion groove can be sandwiched between the inner wall surfaces of the shaft insertion groove. . Thereby, the vibrator is securely fixed to the rotating shaft.

  In particular, as the motor becomes smaller, the structure for attaching the vibrator to the rotating shaft becomes finer. For this reason, for example, in a conventional vibration generating motor that is fixed to the attachment member through the rotation shaft, the thickness of the attachment member is reduced, and the attachment member is easily damaged. The vibrator according to claim 1 is a vibrator having a very simple structure in which a shaft insertion groove is formed on the shaft fixing surface. For this reason, even if the motor is miniaturized, each part of the vibrator maintains a constant thickness, so that the vibrator is not damaged. As a result, the vibrator of claim 1 has high durability performance even when the motor is downsized.

  According to a second aspect of the present invention, the shaft fixing surface of the vibrator is a cut surface formed by cutting the column body in the axial direction.

  Since the present invention is configured as described above, the following effects can be obtained.

  That is, by pressing and compressing the vicinity of the shaft insertion groove on the shaft fixing surface with the press piece, the press piece forms a press concave portion and causes the inner wall surface of the shaft insertion groove to project inward. This overhang reduces the width of the shaft insertion groove, and the rotation shaft is sandwiched between the inner wall surfaces of the shaft insertion groove. For this reason, the vibrator is securely fixed to the rotating shaft, and even if the motor is downsized, the vibrator does not come off the rotating shaft. As a result, if the present invention is used, a vibrator having excellent durability can be manufactured.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a vibration generating motor according to the present embodiment. As shown in FIG. 1, the vibration generating motor 1 includes a vibrator 4 made of tungsten nickel that is eccentrically fixed to the rotating shaft 3 of the motor body 2. The vibrator 4 has a block shape obtained by cutting a cylinder in the axial direction, and this cut surface serves as a shaft fixing surface 5 for fixing the rotating shaft 3. A shaft insertion groove 6 penetrating both end surfaces is formed in the shaft fixing surface 5, and a cross section perpendicular to the extending direction of the shaft insertion groove 6 in the vibrator 4 has a half-moon shape. As shown in FIG. 2, the shaft insertion groove 6 is an R groove having a diameter substantially the same as the diameter of the rotation shaft 3, and the rotation shaft 3 is inserted into the shaft insertion groove 6. A pair of press recesses 7 are compression-molded in the vicinity of the shaft insertion groove 6 on the shaft fixing surface 5 with the shaft insertion groove 6 interposed therebetween. The press recess 7 has a wide trapezoidal shape on the opening side, and an overhang 8 is formed on the inner wall surface 6 a of the shaft insertion groove 6 by compression molding of the press recess 7. The rotating shaft 3 is caulked by the overhang 8, and the vibrator 4 is securely fixed to the rotating shaft 3. The shaft insertion groove 6 may be a U groove having a diameter substantially the same as the diameter of the rotary shaft 3. Further, the width of the shaft insertion groove 6 is about 0.8 mm, and the distance between the pair of press recesses 7 is about 1.0 mm.

  Next, a method for fixing the vibrator according to the present embodiment will be described. As shown in FIG. 3A, the vibrator 4 is placed on the vibrator fixing base 9, and a press member 10 made of tungsten carbide is disposed above the vibrator fixing base 9. A pair of press pieces 11 having a trapezoidal cross section project from the lower end of the press member 10, and the upper end of the press member 10 is fixed to a drive arm (not shown). The press member 10 is raised and lowered as the drive arm moves up and down.

  Since the diameter of the shaft insertion groove 6 is substantially the same as the diameter of the rotary shaft 3, as shown in FIG. 3B, simply by pushing the rotary shaft 3 into the shaft insertion groove 6 from one end face of the vibrator 4. The rotary shaft 3 can be inserted into the shaft insertion groove 6. Thereafter, as shown in FIG. 4C, when the drive arm is driven to lower the press member 10, the shaft fixing surface 5 of the vibrator 4 is uniformly compressed by the pair of press pieces 11. As a result, as shown in FIG. 4 (d), the pair of press recesses 7 are compression-molded on both sides of the shaft insertion groove 6. In addition, a pair of overhangs 8 are formed on the inner wall surface of the shaft insertion groove 6 by the compression of these press pieces 11. These overhangs 8 wrap the rotary shaft 3 in the inner wall surface of the shaft insertion groove 6, and the rotary shaft 3 can be caulked by the inner wall surface of the shaft insertion groove 6. As a result, the vibrator 4 is securely fixed to the rotating shaft 3.

  In particular, when the motor becomes smaller, the structure for attaching the vibrator 4 to the rotating shaft 3 becomes finer. However, since the vibration generating motor 1 of this embodiment has a simple structure in which the rotating shaft 3 is inserted into the shaft insertion groove 6 provided on the shaft fixing surface 5, the vibrator 4 is damaged due to the miniaturization of the motor. It won't be easy. Conventionally, since the rotating shaft is fixed by caulking the mounting member of the vibrator, the mounting member that has become thinner due to the miniaturization of the motor may be damaged. However, in the fixing method of the present embodiment, the rotating shaft 3 is caulked by applying a force perpendicular to the thickest shaft fixing surface 5, so that even if the motor is downsized, cracks or There is no fear of chipping, and the vibrator 4 can be fixed stably.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it is also possible to change as follows, for example.

  (1) In the above embodiment, the pair of overhangs 8 are formed in the shaft insertion groove 6 of the vibrator 4 by using the press member 10 having the pair of press pieces 11, but the single press piece 11 is provided. A single overhang 8 may be formed in the shaft insertion groove 6 of the vibrator 4 using the press member 10. Alternatively, three or more overhangs 8 may be formed in the shaft insertion groove 6 of the vibrator 4 by using a press member 10 having three or more press pieces 11. Even in these cases, the rotary shaft 3 can be securely caulked by the inner wall surface of the shaft insertion groove 6.

  (2) In the above embodiment, the cross section of the vibrator 4 has a half-moon shape, but may be a rectangular shape, a trapezoidal shape, or the like.

  (3) In the above embodiment, the cross section of the press concave portion 7 has a trapezoidal shape wide on the opening side, but may be a triangular shape or the like.

It is a perspective view showing one embodiment of a vibration generating motor concerning the present invention. FIG. 2 is a cross-sectional view showing a main part of the vibrator of FIG. 1. (A) (b) is a perspective view which shows the process of the fixing method of the vibrator | oscillator based on this invention. (C) (d) is a perspective view which shows the process of the fixing method of the vibrator | oscillator based on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vibration generating motor, 3 ... Rotating shaft, 4 ... Vibrator, 5 ... Shaft fixing surface, 6 ... Shaft insertion groove, 6a ... Inner wall surface, 7 ... Press recessed part, 8 ... Overhang, 11 ... Press piece.

Claims (2)

A vibrator that is eccentrically fixed to the rotation shaft of the vibration generating motor,
A shaft fixing surface for fixing the rotating shaft;
A shaft insertion groove formed on the shaft fixing surface for inserting the rotating shaft,
The vibrator of the vibration generating motor, wherein the shaft fixing surface has a flat surface compressed by a press piece descending in a direction perpendicular to the shaft fixing surface in the vicinity of the shaft insertion groove.   2. The vibrator of a vibration generating motor according to claim 1, wherein the shaft fixing surface is a cut surface formed by cutting a column body in an axial direction.

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